Smoke-consuming furnace and air-heater



(No Model.) 2 Sheets-Sheet l.,

P. W. WIESEBROOK. SMOKE GONSUMING FURNACE AND AIR EEATER.

No. 398,684. Patented Feb. 26, 1

jw/yezzio'r w miwzzmwam A! 7 W l/W P. W. WIESEBROGK. SMOKE UONSUMINGFURNACE AND AIR HEATER.

I (No Model.) 2 SheetsSheet 2. k No. 398,684. Y Patented Feb. 26, 1889;

TTnn @TATES PATENT OFFICE.

FREDERICK ll. \VIESEHROCK, OF LONG ISLAND CITY, NFAY YORK.

SMOKE GONSUMlNG FURNACE AND AIR-HEATER.

SPECIFICATION forming part of Letters Patent No. 398,684, dated February26, 1889.

Application filecllnly 1.9, 1887. Serial No. 244,742. Numodel-l T0 aZZwhom, it may concern.-

Be it known that I, FREDERICK W. \VIESE- BROOK, a citizen of thclfnitedStates, residing at Long Island City, in the county of Queens and Stateof New York, have invented new and useful Improvements inSmoke-Consuming Furnaces and Air-Heaters, of which the following is aspecification.

In heating air for desiecating, metallurgical, and other purposes it hasbeen the general p notice to pass the air over hot surfaces of metal orother material, which method is objectionable in that it demands costlyapparatus and seldom utilizes fifty per cent. of the heat generated bythe fuel consumed, and is only desirable for warn'iing buildings wherethe air must be in a condition suitable for respiration, or for dryingmaterials which would be injuriously aliected by air mixed with theproducts of imperfect combustioncarbonic acid and hydrogen. It has alsobeen proposed in this art to heat air by blowing or otherwise forcing itdirectly through the tire; but thismethod'involves a largeconsumption offuel, in that an excessive quantity of air is forced through the tireand imperfect combustion is the result. This not only means a waste offuel, but the air thus heated is impregnated with sulphurous andcarbonic oxides to such an extent as to render it unsuitable for contactwith articles of food.

The objects of my invention are to avoid the foregoing objections, toprovide a novel air-heating furnace wherein more perfect combustion isobtained, and to purity and place large volumes of hot air in suitablecondition to act upon articles of food fordesiceating the same or formetallurgical and other purposes. These objects I accmnplish by thefeatures of construction and combiimtions of devices hereinafterdescribed and claimed, reference being made to the accompanyin drawings,in which- Figure l is a longitudinal vertical section of a furnace andair-heater constructed according to my invention. Fig. 2 is a transversevertical section t'alcen through the line Jr J' of Fig. l. Fig. 3 is afront elevation of the furnace. Fig. 'l' is a longitudinal section ofone of the side walls of the furnace. Fig. 5 is a view, partly insection, of the furnace connected with a drying house or compartment.

l l l l The reference-nulneral l designatts a structure of masonry,brick, or iron work, comprising side and end walls, a floor, roof,tlues, the.

This structure constituting the body of my furnace and air-heater may beof any desired form and size.

v wall.

At the front of the furnace is arranged the fire-box 2, which has agrate, 3, and the usual charging-door, -;t. A door, 5, in the front furnace-wall communicates with the ash-pit, and is provided with aregister, (5, for regulating the admission of air to the space beneaththe grate and fuel-bed. In rear of the [ire-box 2isarraugedthereignitiou-chanr her 7, which is separated from the fireboxby the bridge wall 8. Above the bridge-wall is arranged an arch-wall, 9,which forms the roof of the fire-box and the reignition-chamber. Thebritilge-wall 8 does not extend quite up to said arcl1wall, leaving apassage, 10, for conveying the products of combustion from the fire-boxto the reignition-chamber. The rear wall of the latter has a series ofdescending or diving openings, 11, formed at" its bottom, which leadinto a vertical flue, l2, communicating at its top with a chimney, 13,beneath said chimney with an upper longitudinal airtlue, 14., and at itsbottom with another airflue, 15.

The air-fines ii and 15 extend the entire length of the furnace and openout through the front wall thereof, the upper flue terminating at saidfront wall and the lower one being carried to any desired pointas, forex ample, that shown at 31 in Fig. 5where heated air is required incarrying out desiceating, metallurgical, or other operations.

I have in Fig. 1 shown the'lower flue broken off at the point where itmay connect with a chamber, which, for the sake of distinction,

may be termed the laboratm'y. At the other side of the laboratory isarranged another fluc, which contains an exhaust-fan, 16, or otherdevice for drawing the air from the furnace and air-heater through thelaboratory. At the front of the upper flue, it, is arranged a slottedregister, 30, which serves to regulate the volume of atmospheric air tobe heated. The side walls of the furnace are provided with air-ducts18,which follow a zigzag course and serve to conduct the air heated bythe passage through said ducts into a transverse duct or passage, 19,formed in the bridge- A series of slots, 20, are providedat the top ofthe passage 19 for discharging the heated air into thereignition-chamber 7. The air-heating ducts in the side walls of thefurnace open out through the front wall thereof, and are providedthereat with suitable dam pers or registers, 21. The chimney is providedwith a suitable damper, 22, and another damper, 23, is arranged in thelower hot-air flue, 15.

The operation of a furnace or air-heating apparatus constructed intheabox'e-described manner is follows, viz: In starting the apparatus,the damper in the hot-air flue 15 is closed, and the damper 22 in thechimney is opened and the tire started in the fire-box. \Vhen thefurnace becomes well heated,which can be ascertained through thepeep-hole 28 in the wall, and when, after admitting air through theducts in the side walls, a body of white flames is visible in thereigniti-onchamber 7, the damper in the chimney is closed and the damperin the hot-air fine 15 opened. At the same time the cold-air register 30in the upper flue, 14, is also opened and the exhaust-fan set in motion.By the use of a pyrometer in the flue 15 the temperature of the air canbe ascertained, and the desired degree of heat maintained by admittingmore or less air through the register 80. \Vhat takes place in theheateritself may be described as follows, viz: The fire being started,the chimney is kept open and the lower flue, 15, closed, and air isadmitted to the fire direct through the register in the ashpit door,while air heated by its passage through the zigzag channels in the sidewalls of the furnace issues through the slots in the bridge-wall andmeets the products of combustion passing over said bridge-wall into thereignitionchamber. This air, passing through the channels in the sideand bridge walls, becomes heated by taking up the heat from the walls,and the gases passin from the fire over the bridge-wall mingle with saidheated air issuing through the slots in the bridgeqvall, and when thetemperature of the air reaches from 600 to 7 00 Fahrenheit said gasesare ignited again, thereby consuming the carbonic oxide. This will causean increase of temperature and a final passing out through the slots inthe rear wall of the reignitionchamber into the descending or divingflue in rear of said chamber of carbonic acid, hydrogen, and whateveroxygen may be left unconsumed, the bulk of the air being at the sametime drawn in through the register 30 and passed over the arch-wall 9,thereby absorbing the heat from said wall, which meets at thedischarge-slots in the rear wall of the reignition-chamber the hotproducts of combustion and becomes well .mixed with the same, and isthen carried off through the flue 15 to the place of destination fordrying, boiling, or heating purposes.

The temperature to which air maybe heated in the manner proposed by mevaries according to the bulk of the air admitted, and temperatures canbe maintained above 1,000 Fahrenheit, and for this reason my inventionis especially adapted for metallurgical processes or for dryingprocesses where large bodies of heated air are required.

Having thus described my invention, what I claim is 1. An air-heatingfurnace for desiccating and similar purposes, provided with a chimney, afire-chamber, a rei gniting-ch amber having outlets in its rear wall, abridge-wall located between the fire-chamber and the reignitin g-chamber an d containing a channel open at its top to the latter, tortuouspassages in the side walls open at the front to the external atmosphereand communicating at the rear with the channel in the bridge-wall, adescending or diving flue located in rear of the reigniting-chamber, andcommunicating with the rear outlet thereof and with the chimney, ahorizontal fresh-air flue extending over the reigniting-chamber andcommunicating at the rear with the upper part of the diving-flue, and ahorizontal flue at the base extending under 'the reigniting-chamber, andcommunicating at the rear with the lower part of the diving-flue forconveying the purified hot air therefrom, substantially as described.

2. An air-heating furnace for desiccating and similar purposes, providedwith a chimney containing a damper, a fire-chamber, a reignition-chamberhaving outlets in its rear wall, a bridge-wall located between the tirechamber and reigniting-chamber and containing a channel open at its topto the lat ter, tortuous passages in the side walls open at the front tothe external atmosphere, controlled by valves, and communicatiliig atthe rear with the channel in the bridge-wall, an arch over the fire andreigniting chambers arranged to provide a passage above the bridge-wall,a descending or diving flue located at the rear of thereigniting-chamber, and communicating with the rear outlets thereof andwith the chimney, a horizontal fresh-air flue extending above the arch,controlled at the front by a valve, and communicating at the rear withthe upper part of the diving-flue at a point below the damper in thechimney, and a horizontal flue at the base containing a damper extendingunder the reigniting and fire chambers,'ar d communicating at the rearwith the lower part of the diving-flue for conveying the purified hotair therefrom, substantially as described.

In testimony whereof I have affixed mysignature in presence of twowitnesses.

FREDERICK IV. IES EBROCK.

Witnesses:

LEOPOLD ARNSTEIN, JOHN PETERS.

